I started out with one of those same cabinets and used it for many years before upgrading to a true safe. I bolted mine into the studs with I think 6 long bolts, and then also mounted an old kitchen cabinet over the top of it so that one couldn't really pry at it from the top if they tried. It worked really well as my first "safe" and is something I would certainly recommend to others who didn't have the budget for anything much larger or more robust.